Method and apparatus for detecting synchronization position of lte cell

1. A method for detecting a synchronization position of a long term evolution LTE cell, comprising: selecting by a terminal device, a part of sampling points from all sampling points of received data via receiving through an antenna of the terminal device, wherein the selected part of sampling points are output by a memory, and the received data is generated by filtering a local sequence from a base station, wherein the selecting of the part of sampling points from all sampling points of the received data comprises: selecting by the terminal device, from all the sampling points of the received data and by taking a position of a cell with the strongest signal as a center, sampling points within the width of a preset window as the part of the sampling points; carrying out by the terminal device, correlation operations on the part of the sampling points, and obtaining multiple first correlation results and multiple pieces of first position information that correspond to the part of the sampling points; and determining by the terminal device, a maximum first correlation result among at least one first correlation result greater than a preset threshold in the multiple first correlation, and taking a piece of first position information, which corresponds to the maximum first correlation result, as a synchronization position.

2. The method according to claim 1 , before the selecting the part of sampling points from all sampling points of received data, further comprising: determining by the terminal device, in time division duplex TDD mode, whether valid synchronization information is found, and, if yes, performing the step of selecting the part of sampling points from all sampling points of received data.

3. The method according to claim 2 , further comprising: in the TDD mode, when it is determined that no valid synchronization information is found, carrying out correlation operations on all the sampling points of the received data, and obtaining multiple second correlation results and multiple pieces of second position information that correspond to all the sampling points; and determining by the terminal device, a maximum second correlation result among at least one second correlation result greater than a preset threshold in the multiple second correlation results, and taking a piece of second position information, which corresponds to the maximum second correlation result, as the synchronization position.

4. The method according to claim 1 , before the selecting the part of sampling points from all sampling points of received data, further comprising: determining by the terminal device, in frequency division duplex FDD mode, whether the number of cells in a cell synchronization list is greater than or equal to a preset lower threshold, and, if yes, performing the step of selecting the part of sampling points from all sampling points of received data.

5. The method according to claim 4 , further comprising: in the FDD mode, when it is determined that the number of cells in the cell synchronization list is less than the preset lower threshold, carrying out correlation operations on all the sampling points of the received data, and obtaining multiple second correlation results and multiple pieces of second position information that correspond to all the sampling points; and determining by the terminal device, a maximum second correlation result among at least one second correlation result greater than a preset threshold in the multiple second correlation results, and taking the piece of second position information, which corresponds to the maximum second correlation result, as the synchronization position.

6. The method according to claim 1 , wherein the selecting the part of sampling points from all sampling points of received data comprises: selecting by the terminal device, from all the sampling points of the received data and by taking a position of at least one cell in the cell synchronization list as a center, sampling points within the width of a preset window as the part of the sampling points.

7. The method according to claim 1 , wherein: the selecting the part of sampling points from all sampling points of received data comprises: controlling a random access memory RAM to cache the part of the sampling points among all the sampling points of the received data; and the carrying out correlation operations on the part of the sampling points comprises: by using a time division multiplexing working manner, carrying out the correlation operations on the part of the sampling points output by the RAM.

8. An apparatus for detecting a synchronization position of a long term evolution LTE cell, comprising program instructing relevant hardware executing program codes stored in a non-transitory computer readable storage medium to perform functions, which configures the apparatus to: select a part of sampling points from all sampling points of received data, and by taking a position of a cell with the strongest signal as a center, the sampling points within the width of a preset window as the part of the sampling points, wherein the received data is generated by filtering a local sequence from a base station; carry out correlation operations on the part of the sampling points, and obtain multiple first correlation results and multiple pieces of first position information that correspond to the part of the sampling points; and determine a maximum first correlation result among at least one first correlation result greater than a preset threshold in the multiple first correlation results and take a piece of first position information, which corresponds to the maximum first correlation result as a synchronization position.

9. The apparatus according to claim 8 , wherein the apparatus is further configured to: determine, in time division duplex TDD mode whether valid synchronization information is found, and, if yes, select the part of the sampling points from all the sampling points of the received data.

10. The apparatus according to claim 9 , wherein the apparatus is further configured to: to select all the sampling points of the received data in the TDD mode and when it is determined that no valid synchronization information is found; carry out correlation operations on all the sampling points of the received data, and obtain multiple second correlation results and multiple pieces of second position information that correspond to all the sampling points; and determine a maximum second correlation result among at least one second correlation result greater than a preset threshold in the multiple second correlation results, and take the piece of second position information, which corresponds to the maximum second correlation result, as the synchronization position.

11. The apparatus according to claim 8 , wherein the apparatus is further configured to: determine, in frequency division duplex FDD mode, whether the number of cells in a cell synchronization list is greater than or equal to a preset lower threshold, and, if yes, select the part of the sampling points from all the sampling points of the received data.

12. The apparatus according to claim 11 , wherein the apparatus is further configured to: select all the sampling points of the received data in the FDD mode when it is determined that the number of cells in the cell synchronization list is less than the preset lower threshold; carry out the correlation operations on all the sampling points of the received data, and obtain multiple second correlation results and multiple pieces of second position information that correspond to all the sampling points; and determine a maximum second correlation result among at least one second correlation result greater than a preset threshold in the multiple second correlation results, and take the piece of second position information, which corresponds to the maximum second correlation result, as the synchronization position.

13. The apparatus according to claim 8 , wherein the apparatus is further configured to: select, from all the sampling points of the received data and by taking the position of at least one cell in the cell synchronization list as a center, the sampling points within the width of a preset window as the part of the sampling points.

14. The apparatus according to claim 8 , wherein: the apparatus further comprises a random access memory RAM, configured to receive all the sampling points of the received data, start or stop under control of the work window control unit, and in a start state, cache the received sampling points and output them to the correlation operation unit; the apparatus is further configured to: start the RAM when the part of sampling points are selected from all the sampling points of the received data and a current sampling point belongs to the part of the sampling points, and stop the RAM when the part of sampling points are selected from all the sampling points of the received data and the current sampling point does not belong to the part of the sampling points; start the RAM when all the sampling points of the received data are selected; and use a time division multiplexing working manner to carry out the correlation operations on the part of the sampling points output by the RAM.

15. The apparatus according to claim 8 , wherein the apparatus is further configured to: start the correlation operation and when the part of sampling points are selected from all the sampling points of the received data and a current sampling point belongs to the part of the sampling points, stop the correlation operation when the part of sampling points are selected from all the sampling points of the received data and the current sampling point does not belong to the part of the sampling points; and start the correlation operation when all the sampling points of the received data are selected.